Opencv shape detection

1. How to detect a square using OpenCV?
2. What is shape detection?
3. Can OpenCV do object detection?

How to detect a square using OpenCV?

Compute the aspect ratio of the contour cnt. Set a range of aspect ratios to detect the square. We set it [0.9, 1.1]. If the ratio is between 0.9 and 1.1, the detected contour is a square else it is a rectangle.

What is shape detection?

The Shape Detection API is a set of services exposing image processing like OCR (text detection), barcode/QR scanning or face detection capabilities of the underlying system to the Web applications. The availability and quality of the detection varies on the OS & hardware – the API exposes those services as-is.

Can OpenCV do object detection?

OpenCV is the huge open-source library for computer vision, machine learning, and image processing and now it plays a major role in real-time operation which is very important in today's systems. By using it, one can process images and videos to identify objects, faces, or even the handwriting of a human.